THE FUNDAMENTAL OF PRINTED CIRCUIT BOARD (C.WHAT IS NC DRILL FILE)
C.WHAT IS NC DRILL FILE
Excellon is a manufacturer of CNC control systems for both drillers and routers. This company has been in the business of CNC control for many years. The Excellon Company can be best described as one of the pioneers Printed Circuit board drillers and routers.
The term "Excellon Drill File" is a bit of a misnomer, as the company's name has been attached to what should be simply described as an NC (numeric control) drill file. The most popular format of this data is Excellon's and is described in the following section. Although the term "Excellon" has been coined into the CAD environment don't let it confuse the issue of NC drill data.
There are many manufactures of drilling and routing equipment today. Most are fully compatible with Excellon's control codes. Some PCB vendors still require an older format known as EIA-Binary because their drill systems use an older paper tape reader system. Modern drilling equipment now uses the preferred ASCII drill formats and a PC or similar control computer interpret the ASCII files.
THE NC DRILL FILE can be opened by Notepad. The NC drill file should have Tooling Size, and X Y info of the holes. An Nc drill example is below: T define the hole size, X Y define the hole location. NC drill file can also define the NPTH holes, the best way is to generate a separate NC drill for NPTH holes ( Non-plated holes).
Section
A. WHAT IS PCB
C. WHAT IS NC DRILL FILE
G. HOW TO DEFINE THE PCB YOU WANT